The answer to "What are my chances, doctor?" depends on whom is asked: prognostic disagreement and inaccuracy for critically ill patients

Physicians often must make prognostic judgments for critically ill patients, but we know little about how well they can perform this task. We prospectively measured disagreements among different physicians' quantitative prognostic judgments for 269 sequential admissions to an ICU, and evaluated the accuracy and discriminating ability of judgments made by different types of physicians. Many (44.7%) patients provoked one or more disagreements of at least 20 percentage points among the three possible pairings of physicians. Many patients whom one physician thought were certain to survive did not inspire such certainty in another of their doctors. The critical care attendings thought the changes of survival were less than or equal to 80% for 23, and between 81% and 95% for another 46 of 85 patients whom the patients' own attendings thought were certain to survive. There were some differences in the accuracy of the different physicians' estimates. All doctors showed excellent overall discriminating ability, but discriminated less well for postoperative patients. Lack of consensus about how to judge prognosis for critically ill patients may make it difficult to decide whom to admit to ICUs. These results underscore the need for valid predictive models to aid in decision-making for critically ill patients.     

Geriatric critical care

Demographic compulsions are inescapable. There has been a 50% increase in life expectancy at birth for persons born in 1980 compared to those born in 1900. Not only do critical care units utilize up to a third of hospital expenditures and about 1% of GNP, the critically ill elderly consume a disproportionate amount of ICU resources. Outcome prediction models for very elderly critically ill patients have been proposed with age as one of numerous model variables; but such models have not been widely validated. Despite the burgeoning emphasis on evidence-based population approach to health care, there is insufficient research to guide the critical care clinician. There remains a modicum of subjectivity in crucial decisions that affect the elderly patient receiving intensive care. Older age is also one of the factors that lead to a physician bias in refusing ICU admission; this has recently been borne out in a multivariate analysis. Physicians generally consider their older patients' quality of life to be worse than do the patients, although other studies that have assessed the quality of live show no age-related differences among ICU survivors. Furthermore, physicians' estimations of patient quality of life significantly influence physicians' attitudes to futility of care issues, in contrast to patients' perceptions. Threshold for life-sustaining treatment in the elderly will continue to be different among the ICUs. In critical care of the elderly, geography may well be destiny. Clinical decisions will be subjected to many ethical, legal, and socioeconomic pressures. Personal and religious beliefs will inevitably influence societal expectations and clinician practices. Severity of illness has the biggest influence on outcome in a critical illness. Age alone is not a predictor of short-term or long-term outcome in the older patient who is critically ill. Critical illness in the elderly remains a fertile area for future research.     

Outcome and functional capacity after prolonged intensive care unit stay

BACKGROUND: An important proportion of critically ill patients who survives their acute illness remains in a critical state requiring intensive care management for weeks to months. Nevertheless, data on risk factors for in-hospital mortality and especially for long-term mortality and functional capacity are scarce. This study investigated outcome and prognostic factors in long-term critically ill patients. METHODS: This retrospective observational cohort study was performed at our mixed adult 8-bed cardiologic ICU at a 2200-bed University Hospital. Patient data from our local database connected to an Austrian multicenter program for quality assurance in intensive care were analyzed. Data were collected between March 1(st), 1998 and December 31(st), 2003. Patients with an ICU stay > or =30 days formed the long-term study group. Morbidity and functional capacity were assessed using the Barthel mobility index in telephone interviews. RESULTS: Patients spending > or =30 days in the ICU numbered 135 (10%) and occupied 5962 bed-days, representing 40.9% of the total bed-days. Compared with patients with an ICU stay <30 days, patients in the long-term group had a significantly higher SAPS II score during the first 24 hours after ICU admission (54 [IQR 41-65] vs. 38 [IQR 27-56], p < 0.001). There was a trend towards male preponderance in the long-term group (98/135 [82.6%] vs. 782/1215 [64.4%], p = 0.05). Differences in ICU and in-hospital mortality were not significant (28/135 (20.7%) vs. 295/1215 (24.3%), p = 0.620 and 46/135 [34.1%] vs. 360/1215 [29.6%], p = 0.285, respectively). After 12 and 48 months, the overall cumulative rates of death in hospital survivors were 14% and 26%, respectively in the short-term ICU group and 31% and 61% in the long-term group. A log-rank test revealed a significantly higher probability of survival in the short-term group after hospital discharge (log rank = 34.3, p < 0.001). Multivariate analysis of hospital survivors and non-survivors in the long-term group showed that the need for renal replacement therapy during the ICU stay was the sole independent predictor for in-hospital death and death within 1 year after ICU discharge (OR = 2.88; 95%CI 1.12-7.41, p = 0.028 and OR = 3.66, 95%CI 1.36-9.83, p = 0.01, respectively). In 28/31 long-term survivors (90%) in the long-term ICU group, the Barthel index indicated no or only moderate disability during daily activities. CONCLUSION: Hospital mortality rates in critically ill patients with a stay <30 or > or =30 days were comparable. The necessity for renal replacement therapy was the sole independent predictor for in-hospital and 1-year mortality in long-term ICU patients. Critically ill patients with a stay > or =30 days have a high and ongoing risk of death after hospital discharge; however, a substantial number of these patients are long-term survivors with no or only moderate disability during daily activities.     

Impact of prolonged elevated heart rate on incidence of major cardiac events in critically ill patients with a high risk of cardiac complications

OBJECTIVE: To assess the incidence of major cardiac events in critically ill patients with a high risk of cardiac complications presenting with an elevated heart rate. DESIGN AND SETTING: Observational, retrospective study in a 15-bed medical/surgical Intensive Care Unit (ICU) at a university hospital for a period of 12 months. PATIENTS: We studied patients with a high risk of cardiac complications, according to the revised Goldman index, who were treated for at least 36 hrs in the ICU. Patients presenting with prolonged elevated heart rate, defined as a heart rate >95 beats/min for >12 hrs in at least one 24-hr period of their ICU stay, were investigated. Cardiac high-risk patients not developing this criterion served as controls. Major cardiac events, defined as nonfatal myocardial infarction, nonfatal cardiac arrest, and cardiac related death, were the primary outcome measures. RESULTS: From a total of 791 patients, 69 patients were assessed as cardiac high-risk patients. Of 39 patients with prolonged elevated heart rates, 19 (49%) sustained major cardiac events, whereas in the control group of 30 patients, only four patients (13%) had a major cardiac event (p = .002; odds ratio, 6.2). Patients with elevated heart rate had to be treated 4.5 days longer in the ICU (p = .01), whereas the ICU and 30-day post-ICU discharge survival rates did not differ significantly. CONCLUSIONS: In this study, we provide evidence for an increased incidence of major cardiac events in critically ill, cardiac high-risk patients with a prolonged elevated heart rate during their ICU stay. In addition, elevated heart rate was associated with a significantly longer ICU stay.     

Preventable readmission to intensive care unit in critically ill cancer patients

BACKGROUND: Readmission to intensive care unit (ICU) after discharge to ward has been reported to be associated with increased hospital mortality and longer length of stay (LOS). The objective of this study was to investigate whether ICU readmission are preventable in critically ill cancer patients.METHODS: Data of patients who readmitted to intensive care unit (ICU) at National Cancer Center/Cancer Hospital of Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC) between January 2013 and November 2016 were retrospectively collected and reviewed.RESULTS: A total of 39 patients were included in the final analysis, and the overall readmission rate between 2013 and 2016 was 1.32% (39/2,961). Of 39 patients, 32 (82.1%) patients were judged as unpreventable and 7 (17.9%) patients were preventable. There were no significant differences in duration of mechanical ventilation, ICU LOS, hospital LOS, ICU mortality and in-hospital mortality between patients who were unpreventable and preventable. For 24 early readmission patients, 7 (29.2%) patients were preventable and 17 (70.8%) patients were unpreventable. Patients who were late readmission were all unpreventable. There was a trend that patients who were preventable had longer 1-year survival compared with patients who were unpreventable (100% vs. 66.8%, log rank=1.668, P=0.196).CONCLUSION: Most readmission patients were unpreventable, and all preventable readmissions occurred in early period after discharge to ward. There were no significant differences in short term outcomes and 1-year survival in critically ill cancer patients whose readmissions were preventable or not.     

Spiritual care of families in the intensive care unit

OBJECTIVES: There is growing recognition of the importance of spiritual care as a quality domain for critically ill patients and their families, but there is a paucity of research to guide quality improvement in this area. Our goals were to: 1) determine whether intensive care unit (ICU) family members who rate an item about their spiritual care are different from family members who skip the item or rate the item as "not applicable" and 2) identify potential determinants of higher family satisfaction with spiritual care in the ICU. DESIGN: Cross-sectional study, using data from a cluster randomized trial aimed at improving end-of-life care in the ICU. SETTING: ICUs in ten Seattle-area hospitals. SUBJECTS: A total of 356 family members of patients dying during an ICU stay or within 24 hrs of ICU discharge. INTERVENTION: None. MEASUREMENTS AND MAIN RESULTS: Family members were surveyed about spiritual care in the ICU. Chart abstractors obtained clinical variables including end-of-life care processes and family conference data. The 259 of 356 family members (73%) who rated their spiritual care were slightly younger than family members who did not rate this aspect of care (p = .001). Multiple regression revealed family members were more satisfied with spiritual care if a pastor or spiritual advisor was involved in the last 24 hrs of the patient's life (p = .007). In addition, there was a strong association between satisfaction with spiritual care and satisfaction with the total ICU experience (p < .001). Ratings of spiritual care were not associated with any other demographic or clinical variables. CONCLUSIONS: These findings suggest that for patients dying in the ICU, clinicians should assess each family's spiritual needs and consult a spiritual advisor if desired by the family. Further research is needed to develop a comprehensive approach to ICU care that meets not only physical and psychosocial but also spiritual needs of patients and their families.     

The influence of outreach in the development of the nurse consultant role in critical care: Cause or effect?

BACKGROUND: Critical care nurse consultant roles have evolved against a background of service innovation that has resulted in the development of critical care outreach services. Despite compelling evidence that there was a serious problem with the management of critically ill patients in the ward environment, there is little evidence to support outreach as a concept or as a role for nurse consultants. AIMS: The aims for this part of the study were to: METHODS: A national postal survey of all 72 critical care nurse consultants in post in England by August 2003; response rate 72% (n = 52). All data was entered on to a computer anonymously and analysed using SPSS version 11.5. A factor analysis revealed a sub-set of nurse consultants who had a significantly greater involvement in outreach activity. RESULTS: Critical care nurse consultants have a high involvement in the development of care for critically ill patients outside the traditional boundaries of critical care. A sub-set emerged that has a significantly greater involvement in outreach activity. This includes roles such as working with an individual or team to develop their practice (whole group mean involvement score M = 4.45, outreach M = 4.88, p < 0.001); developing education outside the ICU/HDU (whole group M = 4.13, outreach M = 4.88, p < 0.001) and receiving nurse led referrals from the wards (whole group M = 3.92, outreach M = 4.81, p < 0.001). CONCLUSIONS: Given the lack of evidence for outreach, organisations should consider the high level of involvement of the nurse consultant outside the traditional boundaries of the ICU/HDU.     

The impact of a respiratory therapy consult service on house officers' knowledge of respiratory care ordering

BACKGROUND: Although available studies show that implementation of respiratory care protocols by respiratory therapists can enhance the allocation of respiratory care services, concern has been expressed that respiratory therapists' involvement in assessing patients and in determining treatment plans may detract from medical trainees' education and experience in ordering respiratory care services. OBJECTIVE: Compare the rates of correct responses to case-based questions about respiratory care ordering in two groups of internal medicine house officers at academic medical centers: one group training at an institution using respiratory care protocols (The Cleveland Clinic Foundation) and the other group training in an institution at which respiratory care protocols have not been used (University of Nebraska). DESIGN: Prospective cohort study. SETTING: Two academic medical centers, one using respiratory protocols and the other not using respiratory care protocols. MEASUREMENTS: Percent of correct responses to questions regarding respiratory care management posed in 5 case studies administered to both groups. RESULTS: Responses were available from 41 and 17 internal medicine house officers at The Cleveland Clinic Foundation and University of Nebraska, respectively. Respondents represented postgraduate years one, two, and three, and constituted a similar percentage of all internal medicine house officers at each institution (33%). The rate of correct responses to the 20 questions posed in the 5 case studies was high overall (76.8%) and similar in the two house staff groups (77.2 +/- 11.6% at The Cleveland Clinic Foundation and 75.8 +/- 12.0% at University of Nebraska, p = 0.69). The 95% confidence interval for the difference straddled zero (-5.4%, 8.1%), making it very unlikely that any important difference exists between the two groups in rate of correct responses. Analysis of covariance also showed no difference between groups, suggesting that postgraduate training level did not affect this conclusion. In one of the 5 case studies, the percent of correct responses was higher among trainees where respiratory care protocols were in use (86.8 +/- 18% at The Cleveland Clinic Foundation vs 69.1 +/- 14% at University of Nebraska, p = 0.0001). CONCLUSIONS: In this comparison of internal medicine house officers' knowledge regarding respiratory care ordering at institutions using versus not using respiratory care protocols, the rates of correct responses by both groups were similar and unlikely to differ significantly. For one of the 5 case studies, respondents from the institution using respiratory care protocols scored significantly higher. Taken together, these results suggest that use of respiratory care protocols implemented by respiratory therapists does not detract from internal medicine trainees' expertise in respiratory care management. Whether these results generalize to other institutions or reflect expertise in actual practice remains uncertain.     

Fluid overload before continuous hemofiltration and survival in critically ill children: a retrospective analysis

OBJECTIVE: Continuous venovenous hemofiltration (CVVH) is used for renal replacement and fluid management in critically ill children. A previous small study suggested that survival was associated with less percent fluid overload (%FO) in the intensive care unit (ICU) before hemofiltration. We reviewed our experience with a large series of pediatric CVVH patients to evaluate factors associated with outcome. DESIGN: Retrospective chart review. SETTING: Tertiary children's hospital. PATIENTS: CVVH pediatric ICU patients from November 1997 to January 2003. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: %FO was defined as total fluid input minus output (up to 7 days before CVVH for both hospital stay and ICU stay) divided by body weight. One hundred thirteen patients received CVVH; 69 survived (61%). Multiple organ dysfunction syndrome (MODS) was present in 103 patients; 59 survived (57%). Median patient age was 9.6 yrs (25th, 75th percentile: 2.5, 14.3). Median %FO was significantly lower in survivors vs. nonsurvivors for all patients (7.8% [2.0, 16.7] vs. 15.1% [4.9, 25.9]; p =.02] and in patients with > or =3-organ MODS (9.2% [5.1,16.7] vs. 15.5% [8.3, 28.6]; p =.01). The Pediatric Risk of Mortality Score III at CVVH initiation also was associated with survival in these groups, but by multivariate analysis, %FO was independently associated with survival in patients with > or =3-organ MODS (p =.01). CONCLUSIONS: Survival in critically ill children receiving CVVH in this large series was higher than in previous reports. CVVH survival may be associated with less %FO in patients with > or =3-organ MODS. Prospective studies are necessary to determine whether earlier use of CVVH to control fluid overload in critically ill children can improve survival.     

Microbial cell preparation in enteral feeding in critically ill patients: A randomized,double-blind,placebo-controlled clinical trial

Gut failure is a common condition in critically ill patients in the intensive care unit (ICU). Enteral feeding is usually the first line of choice for nutrition support in critically ill patients. However, enteral feeding has its own set of complications such as alterations in gut transit time and composition of gut eco-culture. The primary aim of this study was to investigate the effect of microbial cell preparation on the return of gut function, white blood cell count, C-reactive protein levels, number of days on mechanical ventilation, and length of stay in ICU. A consecutive cohort of 60 patients admitted to the ICU in University Malaya Medical Centre requiring enteral feeding were prospectively randomized to receive either treatment (n = 30) or placebo (n = 30). Patients receiving enteral feeding supplemented with a course of treatment achieved a faster return of gut function and required shorter duration of mechanical ventilation and shorter length of stay in the ICU. However, inflammatory markers did not show any significant change in the pretreatment and posttreatment groups. Overall, it can be concluded that microbial cell preparation enhances gut function and the overall clinical outcome of critically ill patients receiving enteral feeding in the ICU.     

A high-volume trauma intensive care unit can be successfully staffed by advanced practitioners at night

PurposeIt remains unknown whether critically ill trauma patients can be successfully managed by advanced practitioners (APs). The purpose of this study was to examine the impact of night coverage by APs in a high-volume trauma intensive care unit (ICU) on patient outcomes and care processes.Materials and methodsDuring the study period, our ICU was staffed by APs during the night shift (7 pm-7 am) from Sunday to Wednesday and by resident physicians (RPs) from Thursday to Saturday. On-call trauma fellows and attending surgeons in house supervised both APs and RPs. Patient outcomes and care processes by APs was compared with those admitted by RPs.ResultsA total of 289 patients were identified between July 2013 and February 2014. Median lactate clearance rate within 24 hours of admission was similar between study groups (10.0% vs 9.1%; P = .39). Advanced practitioners and RPs transfused patients requiring massive transfusion with a similar blood product ratio (packed red blood cell:fresh frozen plasma) (2.1:1 vs 1.7:1; P = .32). In a multiple logistic regression analysis, AP coverage was not associated with any clinical outcome differences.ConclusionsOur data suggest that, with adequate supervision, a high-volume trauma ICU can be safely staffed by APs overnight.     

Anxiety, delirium, and pain in the intensive care unit.

Anxiety, agitation, delirium, and pain are common findings in the ICU. These unhealthy states may lead to increased irritability, discomfort, hypertension, tachycardia, cardiac ischemia, harmful motor activity, and psychologic disquiet for the patient. The appropriate treatment of these conditions may lead to decreased morbidity and mortality in the critically ill patient. Unfortunately, the management of anxiety, agitation, delirium, and pain in the intensive care unit is not ideal. Many patients interviewed after an ICU stay rate their pain control as poor and their memories of their stay as unpleasant. Furthermore, many caregivers lack sufficient understanding of the appropriate or indicated uses of drugs to allay patients' fears and pain. The use of suitable protocols for the proper titration of sedation of mechanically ventilated patients and monitoring of the level of sedation in ventilated patients may decrease the amount of time that patients are ventilated and may alleviate some of the emotional stresses of recall of painful procedures or uncomfortable mechanical ventilation. Future research into protocols for the care of the critically ill patient can enhance the overall well-being of these patients.     

Sedation assessment in critically ill adults.

OBJECTIVE: To review methods for assessing sedation in critically ill adults, discuss their impact on patient outcomes, and provide recommendations for implementing these methods into clinical practice in the intensive care unit (ICU). DATA SOURCES: A computerized search of MEDLINE from 1980 through June 2000 and a manual search of abstracts presented at recent critical care meetings were performed. STUDY SELECTION AND DATA EXTRACTION: Sedation assessment tools that have been used to titrate therapy in adult, critically ill patients were identified. Special emphasis was placed on sedation assessment instruments that have been prospectively validated. Objective methods that have been used to assess sedation therapy were also identified. DATA SYNTHESIS: Twenty-three adult sedation assessment instruments were identified. Few scales have been prospectively evaluated for validity (n = 6) or reliability (n = 7). Other methods of sedation assessment were identified (e.g., bispectral index monitor); however, most of these methods have only been studied in small subsets of critically ill patients. CONCLUSIONS: Incorporation of sedation assessment into ICU clinical practice may improve patient care. These sedation assessment instruments must be further evaluated to determine their impact on quality of care and ICU length of stay.     

Reduction of colonization and infection rate during pediatric intensive care by selective decontamination of the digestive tract

OBJECTIVE: To compare the effects of two different antibiotic regimes on the colonization and infection rates of critically ill pediatric patients. DESIGN: A prospective randomized trial. SETTING: A pediatric ICU in a university hospital. PATIENTS: Fifty critically ill pediatric patients who required intensive care for at least 4 days were randomly allocated to either the selective parenteral and enteral antisepsis regimen (treatment group, n = 25) or the control group (n = 25). INTERVENTIONS: The treatment group received oral nonabsorbable antimicrobial agents (polymyxin E, gentamicin, and amphotericin B) and parenteral cefotaxime, whereas the control group received either perioperative antibiotic prophylaxis or antibiotic therapy according to clinical or microbiological evidence of infection. RESULTS: Both groups were comparable for age, body weight, sex, and severity of illness. Colonization with Gram-negative microorganisms and yeasts in the oropharynx, and digestive and respiratory tracts increased rapidly up to 52% in the control group, whereas there was no colonization with these microorganisms in the treatment group. The occurrence rates of acquired secondary infections in the control and treatment groups were 36% and 8%, respectively (p less than .025). There were no differences between groups in the duration of intensive care or mortality rate. CONCLUSION: Selective oropharyngeal and gastrointestinal decontamination combined with systemic cefotaxime application allows for a significant reduction of the colonization rate with Gram-negative bacteria and yeasts in critically ill pediatric patients undergoing prolonged intensive care. In addition, it significantly reduces the Gram-negative infection rate of the respiratory system. However, this therapeutic approach does not alter ICU length of stay or mortality rate.     

Staff knowledge,attitudes and practices regarding glycaemic management in adult intensive care units: A national survey

Background

Hyperglycaemia is common in critically ill adult patients. Many studies have identified the content, methods, and effects of glycaemic control but have not explored the effects of knowledge, attitudes, and practices (KAP) on glycaemic control in critically ill adults. Various factors also influence the KAP of intensive care unit (ICU) staff.

Aims

To assess KAP regarding glucose management for critically ill adults among nurses and medical professionals and identify the factors that influence their KAP in ICUs.

Methods

A multicentre cross-sectional survey.

Results

In total, 403/459 (response rate: 87.8%) participants from ICUs in nine tertiary hospitals in China participated in this study, 82.4% of whom were female and 93.4% of whom were nurses. The mean work experience was 8.88 years, and the mean critical care experience was 6.59 years. The scoring rate for the three dimensions of knowledge, attitudes, and practices were 82.35%, 87.69%, and 76%, respectively. We did not find any other factors affecting the KAP scores except for the level of knowledge awareness (p < 0.001), awareness of the importance (p < 0.001), and training for glucose control (p = 0.004).

Conclusion

ICU staff KAP regarding glycaemic control in critically ill adults among ICU professionals were acceptable in China. However, ICU professionals' current knowledge regarding nutrition, glucose variability, and skills related to glucose management could be improved.

Relevance to Clinical Practice

ICU educators should provide more skills-related training for healthcare professionals in the glycaemic management of critically ill adults. Moreover, the process of managing blood glucose in adult ICU patients is a collaborative, multidisciplinary team effort, with monitoring and feedback required during implementation.     

Convalescent plasma therapy in patients with COVID-19

IntroductionPassive antibody therapy has been used to immunize vulnerable people against infectious agents. In this study, we aim to investigate the efficacy of convalescent plasma (CP) in the treatment of severe and critically ill patients diagnosed with COVID-19.MethodThe data of severe or critically ill COVID-19 patients who received anti-SARS-CoV-2 antibody-containing CP along with the antiviral treatment (n = 888) and an age-gender, comorbidity, and other COVID-19 treatments matched severe or critically ill COVID-19 patients at 1:1 ratio (n = 888) were analyzed retrospectively.ResultsDuration in the intensive care unit (ICU), the rate of mechanical ventilation (MV) support and vasopressor support were lower in CP group compared with the control group (p = 0.001, p = 0.02, p = 0.001, respectively). The case fatality rate (CFR) was 24.7 % in the CP group, and it was 27.7 % in the control group. Administration of CP 20 days after the COVID-19 diagnosis or COVID-19 related symptoms were associated with a higher rate of MV support compared with the first 3 interval groups (≤5 days, 6?10 days, 11?15 days) (p=0.001).ConclusionCP therapy seems to be effective for a better course of COVID-19 in severe and critically ill patients.     

Peripherally inserted central catheters in the intensive care unit

We report the success rate and complications of peripherally inserted central catheters (PICCs) in patients hospitalized in an intensive care unit (ICU). We performed a cohort study in the ICU of a large tertiary care, university-affiliated community hospital. All ICU patients for whom their attending physicians requested a PICC service consultation were included. Main outcome measurements included (1) the success rate for initial PICC placement, (2) the placement complication rate, and (3) the overall success and complication rate. Of the 91 consecutive attempts at PICC placement, 89 (97.8%) were successful: of the 89 successful placements, 25 (28%) required cutdown procedures. There were 20 complications of initial placement and 8 delayed complications, which occurred in 19 PICCs. Complications included recatheterization after first attempt was unsuccessful (10), catheter malposition (7), palpitations or catheter clotting (3 each), heavy bleeding or mechanical phlebitis (2 each), and arterial puncture (1). The overall success rate for completion of therapy using the PICC was 74.7%. The most frequent reasons for failure to complete therapy were catheter dislodgment in 8 patients and "infection" in 9 patients. Of these 9 patients with "infections," 8 catheters were discontinued due to potential infection, and only 1 was removed due to confirmed infection. The confirmed infection rate was 6/10,000 patient days. The PICC appears to be a reasonable alternative to other approaches to peripheral and central venous access. The initial and overall success rates from this preliminary study justify further evaluation of the PICC in critically ill patients.     

重症患者离子钙水平对预后的影响

目的 探讨重症监护病房(ICU)重症患者钙代谢异常的发生情况以及离子钙水平对预后的影响.方法 采用单中心前瞻性观察性研究,选择2013年1月至2015年1月入住无锡市人民医院综合性ICU的重症患者进行筛选,所有入选的患者入ICU后24h内血标本送检,测离子钙水平记为iCa,按iCa水平进行分组:iCa＜ 1.15 mmol/L纳入低iCa组;iCa＞ 1.25 mmol/L纳入高iCa组;1.15 mmol/L≤iCa≤1.25 mmol/L纳入正常iCa组.统计患者的性别、年龄、手术史、既往病史、人ICU诊断、机械通气时间、ICU住院时间以及转归等信息并计算入ICU24 h内的序贯器官衰竭评分(SOFA)和急性生理学与慢性健康状况评分系统Ⅱ(APACHEⅡ)评分.采用Logistic回归分析筛选重症患者死亡的危险因素;采用Kaplan-Meier生存分析,按iCa水平分层,绘制14 d生存曲线,采用log-rank检验比较低iCa组和正常iCa组的累计生存率.结果 共纳入重症患者368例,其中正常iCa组117例,低iCa组247例,高iCa组4例.正常iCa组以神经系统病变最多见(21.37％),低iCa组以脓毒症最多见(21.46％),高iCa组以肿瘤患者最多见(50％).低iCa组脓毒症患者(21.46％)多于正常iCa组(10.26％),高iCa组无脓毒症患者,组间差异具有统计学意义(P =0.021).正常iCa组肿瘤患者(1.71％)明显少于高iCa组(50％)和低iCa组(8.1％),差异具有统计学意义(P =0.002).低iCa组较正常iCa组有更多患者合并慢性肾功能不全(P=0.042).两组性别、年龄、血钠、血钾、血氯水平、APACHEⅡ评分差异无统计学意义(P＞0.05),但低iCa组SOFA评分(P=0.039)和14 d病死率(P =0.035)更高,机械通气时间(P =0.049)和ICU住院天数(P =0.012)也更长.根据多因素Logistic回归分析显示,iCa水平(OR=2.352,95％ CI:1.039 ～4.023,P=0.041)和APACHEⅡ评分(OR=1.214,95％ CI:1.067～1.285,P=0.002)为影响ICU重症患者14 d内死亡的独立危险因素.按iCa水平分层绘制Kaplan-Meier生存曲线,低iCa组14 d累计生存率显著低于正常iCa组,差异有统计学意义(P =0.037).结论 离子钙水平与ICU重症患者病死率密切相关,临床应重视重症患者低钙血症的发生.     

Impact of patient volume on the mortality rate of adult intensive care unit patients

OBJECTIVE: Expert task forces have proposed that adult critical care medicine services should be regionalized in order to improve outcomes. However, it is currently unknown if high intensive care unit (ICU) patient volumes are associated with reduced mortality rate. The objective was to investigate whether high-volume ICUs have better mortality outcomes than low-volume ICUs. DESIGN: Retrospective cohort study analyzing the association between ICU volume and in-hospital mortality using Project IMPACT (a clinical outcomes database created by the Society of Critical Care Medicine). PATIENTS: The analyses were based on 70,757 patients admitted to 92 ICUs between 2001 and 2003. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: The main outcome measure was in-hospital mortality. Hierarchical logistic regression modeling was used to examine the volume-outcome association. The median (interquartile range) ICU volume was 827 (631-1,234) patient admissions per year. The overall mortality rate was 14.6%. After controlling for patient risk factors and ICU characteristics, and clustering, there was evidence that patients admitted to high-volume ICUs had improved outcomes (p = .025). However, this mortality benefit was seen only in high-risk patients treated at ICUs treating high volumes of high-risk patients. CONCLUSIONS: There is evidence that high ICU patient volumes are associated with lower mortality rates in high-risk critically ill adults.     

早期肌钙蛋白I对危重孕产妇重症监护病房住院时间的预测价值

目的评估入重症监护病房（ICU）早期出现肌钙蛋白I（TnI）升高对重症孕产妇ICU住院时间的预测价值。 方法对2014年1月1日至2019年7月1日入住北京大学人民医院ICU的危重孕产妇的临床资料进行回顾性分析。根据入住ICU住院时间是否大于72 h,分为ICU住院时间延长和ICU住院时间非延长2个组。采用多因素Logistic回归方法分析ICU住院时间延长的独立危险因素。采用受试者工作特征（ROC）曲线评价入ICU早期TnI水平及AKI对ICU住院时间延长的预测价值。 结果本研究纳入转入ICU的危重孕产妇119例;其中ICU住院时间延长组47例（39.5%）,非延长组72例（60.5%）。Logistic回归分析发现,早期TnI升高（优势比6.697,95%CI：1.27~35.332,P=0.025）和急性肾损伤（AKI,优势比6.054,95%CI：1.248~29.368,P=0.025）是危重孕产妇ICU住院时间延长的独立危险因素。ROC曲线分析显示,入ICU早期发生TnI升高及AKI对ICU住院时间延长预测的曲线下面积分别为0.741（95%CI 0.65~0.832,P<0.001）和0.729（95%CI 0.634~0.825,P<0.001）;二者联合对ICU住院时间延长预测的曲线下面积为0.806（95%CI 0.723~0.889,P<0.001）。 结论早期出现TnI升高和AKI是预测危重孕产妇ICU住院时间延长的独立危险因素,对ICU住院时间有预测价值。